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تسجيل مستخدم جديدLHCb time-dependent results
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تأليف
Marta Calvi
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This review reports preliminary results of time-dependent measurements of decays of B^0 mesons and B^0_s mesons coming from the analysis of about 36 pb^-1 of data collected by the LHCb experiment during the 2010 run of the Large Hadron Collider at sqrt(s)=7 TeV.
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We report on the first measurements of the LHCb experiment, as obtained from $pp$ collisions at $sqrt{s} = 0.9$ TeV and 7 TeV recorded using a minimum bias trigger. In particular measurements of the absolute $K^0_S$ production cross section at $sqrt{
s} = 0.9$ TeV and of the $bar{Lambda}/Lambda$ ratio both at $sqrt{s} = 0.9$ TeV and 7 TeV are discussed and preliminary results are presented.
At the eve of the second LHC data taking run, some of the most recent results obtained by the LHCb collaboration with Run I data are reviewed. Improved measurements on CP violation, unitary triangle and mixing parameters are shown. Recent progress on
physics in the forward region is illustrated by examples picked up in the electroweak physics and beyond Standard Model searches.
As first Run II data acquisition has begun, it is useful to expose the pending questions by reviewing some of the most recent results obtained with Run I data analyses. Early results of the current data taking and middle-term prospects are also shown
to illustrate the efficiency of the acquisition and analysis chain.
The LHC is the new b-hadron factory and will be dominating flavour physics until the start of Belle II, and beyond in many decay modes. While the $B$ factories and Tevatron experiments are still analysing their data, ATLAS, CMS and LHCb are producing
interesting new results in CP violation and rare decays, that set strong constraints on models beyond that SM and exhibit some discrepancies with the SM predictions. The LHCb collaboration used the LHC 50 ns ramp-up period of July 2015 to measure the double-differential $J/psi$, $J/psi$-from-$b$-hadron and charm cross-sections at $sqrt{s} = 13$ TeV. Both measurements were performed directly on triggered candidates using a reduced data format that does not require offline processing.
A combination of measurements sensitive to the CKM angle $gamma$ from LHCb is performed. The inputs are from analyses of time-integrated $B^{+}rightarrow DK^+$, $B^{0} rightarrow D K^{*0}$, $B^{0} rightarrow D K^+ pi^-$ and $B^{+} rightarrow D K^+pi^
+pi^-$ tree-level decays. In addition, results from a time-dependent analysis of $B_{s}^{0} rightarrow D_{s}^{mp}K^{pm}$ decays are included. The combination yields $gamma = (72.2^{+6.8}_{-7.3})^circ$, where the uncertainty includes systematic effects. The 95.5% confidence level interval is determined to be $gamma in [55.9,85.2]^circ$. A second combination is investigated, also including measurements from $B^{+} rightarrow D pi^+$ and $B^{+} rightarrow D pi^+pi^-pi^+$ decays, which yields compatible results.
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